Ten years after their famous journeys, the Argonauts held a reunion in Argos. After the Golden Fleece was seemingly stolen again, some of the Argonauts set out on a second expedition to retrieve it, with Phoebe, daughter of the Argonaut Lycinus, joining them. (HTLJ: "Once a Hero").
Other than Hercules, Iolaus, and Jason, none of the Argonauts shown in "Once a Hero" appear in the film Young Hercules.
Aside from Hercules and Jason, not one of characters named as Argonauts (Greek: Αργοναύται) were actually among them in mythology – not even Iolaus. Ironically many characters listed amongst Argonauts, or characters bearing the same names, appear in the Xenaverse anyway: